Article
Chemistry, Physical
Nestor M. de los Santos-Lopez, Gabriel Perez-Angel, Jose M. Mendez-Alcaraz, Ramon Castaneda-Priego
Summary: The article systematically studies the depletion interactions between colloidal particles, focusing on how the composition of depletants drives the competition between attraction and repulsion. Results are obtained through theoretical analysis and computer simulations.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Sanghyuk Park, Hyerim Hwang, Shin-Hyun Kim
Summary: This study investigates the phase behaviors of aqueous suspensions using depletion interactions. The concentration of depletant and salt in the suspension is adjusted to produce fluid, crystal, and glass phases. The phase boundary between fluid and crystal is determined by the depth of the energy well, while the onset of glass formation is characterized by the assembly rate. Crystals are formed when enthalpy gain outweighs entropy loss, while glasses are kinetically produced due to fast jamming.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Thomas G. Mason
Summary: This study extends the concept of depletion forces between spheres to depletion torques affecting the orientations of colloidal particles with complex shapes. It demonstrates that depletion torques can be tailored by designing specific geometrical features in the shapes of particles.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Sanghyuk Park, Shin-Hyun Kim
Summary: This study presents a simple and efficient method for producing photonic micropatterns through bottom-up depletion-mediated regioselective growth of colloidal crystals. The method allows high-resolution micropatterning and control over the structural colors through concentration, depletant and salt, as well as particle size. Additionally, secondary colors can be generated through structural color mixing. The findings offer a general approach for designing elaborate photonic micropatterns suitable for various applications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Albert Tianxiang Liu, Marek Hempel, Jing Fan Yang, Allan M. Brooks, Ana Pervan, Volodymyr B. Koman, Ge Zhang, Daichi Kozawa, Sungyun Yang, Daniel I. Goldman, Marc Z. Miskin, Andrea W. Richa, Dana Randall, Todd D. Murphey, Tomas Palacios, Michael S. Strano
Summary: Robots have components that work together to accomplish a task. Colloidal robots are particles capable of functions such as sensing, computation, communication, locomotion, and energy management that are all controlled by the particle itself. Their design and synthesis is an emerging area of interdisciplinary research drawing from materials science, colloid science, self-assembly, robophysics, and control theory.
Article
Physics, Multidisciplinary
Peng Liu, Luhui Ning, Yiwu Zong, Fangfu Ye, Mingcheng Yang, Ke Chen
Summary: In this study, experiments and computer simulations were performed to investigate the effective interactions between like-charged colloidal tracers moving in a two-dimensional fluctuating background of colloidal crystal. The results show the presence of an effective attraction between the tracers, which weakens as the background lattice constant increases. This lattice-mediated attraction is a result of the minimization of free energy increase from deformation of the crystalline background due to the presence of diffusing tracers.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Wei Li, Kris T. Delaney, Glenn H. Fredrickson
Summary: The study developed a SCFT method to investigate polymer-mediated colloidal interactions, focusing on depletion effects and exploring mean-field interactions under different physical conditions. The results demonstrated good agreement with previous studies and experiments, extending the work to new regimes and discussing the mechanisms of attraction and repulsion along with the influence of individual factors.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Engineering, Chemical
Duowei Lu, Pedram Fatehi
Summary: This study developed a mathematical model based on the XDLVO theory and SEI to simulate the interaction energy between ellipsoidal particles with rough surfaces. The results showed that fractal roughness on particle surfaces increased surface roughness and weakened total interaction energy. Ellipsoidal particles provided greater interaction energy than spherical particles due to their larger interaction area. Increasing particle size strengthened interaction energy, while amplifying the aspect ratio diminished it. The orientation angle of ellipsoidal particles also affected their interaction.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
You-Jin Kim, Jae-Hyun Kim, In-Seong Jo, David J. Pine, Stefano Sacanna, Gi-Ra Yi
Summary: Colloidal clusters are formed by assembling PS particles onto liquid cores and can be purified through density gradient centrifugation. Hybrid colloidal clusters are obtained when using silica-PS core-shell particles, breaking symmetry in clusters.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Multidisciplinary Sciences
Zhe Xu, Theodore Hueckel, William T. M. Irvine, Stefano Sacanna
Summary: The research team has created non-biological capsules that can capture, concentrate, store, and release microscopic payloads as needed. This design uses hollow colloids as cell-membrane mimics with a well-defined single pore, allowing for mass production and offering a blueprint for developing smart materials, micro-machinery, and artificial cell mimics.
Article
Multidisciplinary Sciences
Cristian Hernando Acevedo, Ruitao Wu, J. Keith Miller, Eric G. Johnson, Aristide Dogariu
Summary: The study demonstrates that structured external optical fields can create steady-state variations of particle density in three-dimensional regions, and optical vortex beams can dynamically control the spatial density of microscopic particles. These artificial steady-states can be beneficial for applications such as path clearing and mass transportation.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Renhua Deng, Jiangping Xu, Gi-Ra Yi, Jin Woong Kim, Jintao Zhu
Summary: Responsive colloidal polymer particles with well-defined shapes and ordered internal mesostructures have attracted increasing attention for their potential applications in various fields. The 3D confined assembly of block copolymers in emulsion droplets has emerged as a promising method for fabricating these particles. The engineering of anisotropically shaped and internally ordered colloidal polymer particles shows great potential in stimuli-responsiveness and emerging applications.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Multidisciplinary Sciences
Yujie Jiang, Ryohei Seto
Summary: Using simulations, the authors identify the interplay between two lengthscales that generically controls gelation in composite gels. Composite gels, which consist of gel and non-sticky inclusions, are more commonly encountered in reality. Numerical simulations show that the non-sticky particles confine gelation in terms of an effective volume fraction and introduce another competing lengthscale. The ratio of these two lengthscales controls the effects in colloidal composites.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Gerardo Campos-Villalobos, Marjolein Dijkstra, Alessandro Patti
Summary: By using computer simulations, this study investigates the phase behavior of hard-core spherocylinders coated by a soft deformable corona. The competition between different length scales results in the stabilization of unconventional in-plane lattices, including hexagonal, square, high-density hexagonal crystals, and a dodecagonal quasicrystal. This research opens up new opportunities for controlling the assembly of anisotropic nanoparticles to achieve structures with preengineered symmetry-dependent physical properties.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Manish Trivedi, Dhruv Saxena, Wai Kit Ng, Riccardo Sapienza, Giorgio Volpe
Summary: Experiments show that external optical stimulus can reconfigure colloidal random lasers spatially and continuously adjust their lasing threshold. These dynamic random lasers can self-organize and respond to external stimuli, presenting a tunable lasing threshold.
Article
Chemistry, Medicinal
Caitlin Wood, Sean McEvoy, Vladimir Razinkov, Wei Qi, Eric M. Furst, Christopher J. Roberts
JOURNAL OF PHARMACEUTICAL SCIENCES
(2020)
Article
Mechanics
Kimberly A. Dennis, Yan Gao, Alhad Phatak, Philip F. Sullivan, Eric M. Furst
JOURNAL OF RHEOLOGY
(2020)
Article
Chemistry, Physical
Francesco Bonacci, Xavier Chateau, Eric M. Furst, Jennifer Fusier, Julie Goyon, Anael Lemaitre
Article
Mechanics
Yimin Luo, Yu-Fan Lee, Kimberly A. Dennis, Carlos Velez, Scott C. Brown, Eric M. Furst, Norman J. Wagner
Article
Chemistry, Physical
Hojin Kim, Eric M. Furst
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2020)
Article
Chemistry, Multidisciplinary
Hojin Kim, Moujhuri Sau, Eric M. Furst
Article
Chemistry, Medicinal
Caitlin Wood, Vladimir Razinkov, Wei Qi, Eric M. Furst, Christopher J. Roberts
Summary: This study introduces a rapid method to evaluate protein aggregation propensity at air-water interfaces (AWI). Temperature had minimal effect under this technique's rapid interface turnover time scales, while electrostatic protein-protein interactions mediated by pH changes were more influential for particle formation via AWI. Nonionic surfactants substantially reduced particle formation for monoclonal antibodies, but not for a globular protein.
JOURNAL OF PHARMACEUTICAL SCIENCES
(2021)
Article
Physics, Multidisciplinary
Zuyuan Wang, Hojin Kim, Maria Secchi, Maurizio Montagna, Eric M. Furst, Bahram Djafari-Rouhani, George Fytas
Summary: The vibrational eigenmodes of dumbbell-shaped polystyrene nanoparticles were studied using Brillouin light spectroscopy. The experimental spectra were recorded and theoretically calculated. Unlike spherical particles, the eigenmodes of dumbbells exhibit either single or double degeneracy due to their axial symmetry. A new low-frequency peak observed in the BLS spectrum was attributed to the out-of-phase vibration of the two lobes. The quantization of acoustic modes in these molecule-shaped dumbbell particles changes as the separation between the lobes increases.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Francesco Bonacci, Xavier Chateau, Eric M. Furst, Julie Goyon, Anael Lemaitre
Summary: The study investigates the origin of yield stress aging in semidense, saline, and turbid suspensions, highlighting the importance of a time-dependent contact-scale rolling threshold in controlling suspension yield stress and its aging kinetics. The authors establish a constitutive relation between macroscopic shear modulus and yield stress that is applicable to various colloidal systems.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Caitlin V. Wood, Vladimir I. Razinkov, Wei Qi, Christopher J. Roberts, Jan Vermant, Eric M. Furst
Summary: When monoclonal antibodies come into contact with air-water interface, they tend to form aggregates, which has negative effects on their performance. So far, it has been challenging to detect and characterize interfacial aggregation. In this study, the mechanical response induced by interfacial adsorption was examined by measuring the interfacial shear rheology of a model antibody, AS-IgG1, at the air-water interface. The results revealed that strong viscoelastic layers of AS-IgG1 were formed upon protein adsorption, and the compliance of the interfacial protein layer was found to be correlated with the pH and concentration of the bulk solution.
Article
Chemistry, Multidisciplinary
Hojin Kim, Abdellatif Gueddida, Zuyuan Wang, Bahram Djafari-Rouhani, George Fytas, Eric M. Furst
Summary: Phononic materials can alter the propagation of acoustic waves and are useful for metamaterials. In this study, anisotropic crystals with dumbbell-shaped nanoparticles were fabricated, and direction-dependent phononic bandgaps were detected. The local resonances of the constituent nanoparticles enable metamaterial behavior. This study provides a structure-property relationship for designing anisotropic phononic materials with targeted phononic bandgaps.
Article
Mechanics
Qi Li, Kimberly A. Dennis, Yu-Fan Lee, Eric M. Furst
Summary: The dynamics of charged and hard-sphere silica colloidal suspensions are measured and explained using diffusing wave spectroscopy and the Generalized Stokes-Einstein Relation (GSER). The results show qualitative agreement with bulk rheology at high concentration, but with higher quantitative values. The two-point GSER provides better quantitative agreement between bulk and microrheology.
JOURNAL OF RHEOLOGY
(2023)
Article
Physics, Fluids & Plasmas
Nicholas Sbalbi, Qi Li, Eric M. Furst
Summary: We investigated the effects of particle size, concentration, and interactions on the photon transport mean-free path in diffusing wave spectroscopy. For large scatterers, the interactions between them have a weak influence on the mean-free path. However, for scatterers smaller than the wavelength of light, attractive or repulsive interactions can lead to nonmonotonic behavior in the mean-free path, with the effect being strongest for repulsive particles.
Article
Medicine, Research & Experimental
Mahlet A. Woldeyes, Wei Qi, Vladimir Razinkov, Eric M. Furst, Christopher J. Roberts
MOLECULAR PHARMACEUTICS
(2020)
Article
Chemistry, Physical
Yu-Jiun Lin, Jeffrey Horner, Brandon Illie, Matthew L. Lynch, Eric M. Furst, Norman J. Wagner
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2020)